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What does the average rate of a chemical reaction describe?
AHow much product can ever form
BHow much heat the reaction gives
CHow stable the products will be
DHow fast reactants are used up
Answer & Solution
Correct answer: D. How fast reactants are used up
1. A car rusts over years while a match burns in seconds, so reactions run at very different speeds.
2. The average rate measures how quickly the reactants are used, or how quickly the products form.
3. It is worked out as the number of moles used or formed divided by the total time in seconds.
4. How much product could form in total is the yield, which is a different question.
_Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Rate and Extent of Reaction_
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